Within the past six months, a company has experienced a series of attacks directed at various collaboration tools. additionally, sensitive information was compromised during a recent security breach of a remote access session from an unsecure site. as a result, the company is requiring all collaboration tools to comply with the following: secure messaging between internal users using digital signatures
secure sites for video-conferencing sessions
presence information for all office employees
restriction of certain types of messages to be allowed into the network.
which of the following applications must be configured to meet the new requirements? (select two.)

a. remote desktop
b. voip
c. remote assistance
d. email
e. instant messaging
f. social media websites